#include <stdio.h>
#include <math.h>
int main()
{
    int i, j, k, t, s;
    printf(" following are palindrome primes not greater than 1000:\n");
    for (i = 0; i <= 9; i++)
        for (j = 0; j <= 9; j++)
            for (k = 0; k <= 9; k++)
            {
                s = i * 100 + j * 10 + k;
                t = k * 100 + j * 10 + i;
                if (i == 0 && j == 0)
                    t /= 100;
                else if (i == 0)
                    t /= 10;
                if (s > 10 && s == t && a(s))
                    printf("%d\t", s);
            }
}
a(n) int n;
{
    int i;
    for (i = 2; i <= (n - 1) / 2; i++)
        if (n % i == 0)
            return 0;
    return 1;
}